Heating device



Patented a. 14, 1924.

UNITED STATES 1,511,779 PATENT OFFICE.

aominr saannso w AND Joint 003833., or MINNEAPOLIS, minimum, assioxonsTO I mmmw 50mm, or CHICAGO, ILLINOIS.

HEATING DEVICE. i

Application aim 0mm 3,1023. sci-mi no. 006,344.

To all whom it may concern? Be it known that we, Roaan'r Sannnson andJOHN Consnn, citizens of the United States, residents of Minneapolis,countyof Hennepin, and State of Minnesota, have invented certain new anduseful Improvements in Heatin Devices, of which the following is aspecification. v

a This invention relates more particularly to improvements in heatingdevices of the electrical type and includes means for obtaining aplurality of different heating values from the same unit. The selectedembodiment of the invention herein shown is one specifically adapted foruse with motor vehicles employing internal combustion enines and isemployed to raise or maintain the temperature of the cooling medium,usually water, in the cooling system of the engines of this t While thisdevice may be attached to ot er parts of such cooling systems, it ispreferably secured to the engine block. Furthermore, the device 1sadapted for use with the usual commercial circuits. That. is, theelectrical energy is preferably not taken from the usual storage 7battery of vehicles but is supplied from the common commercial linessuch as are usually found in' garages, private or public. While a numberof different heats may be provided, the device is here shown as eapableof a high and a low heat. For example, the low heat may be turned onduring a cold night to guard against freezing of the eoolin fluid, whilethe high heat may be turn on when it is desired to start the cooledengine or to overcome the effects of the engine havin been-left exposedto low tem ratures Wlfi'lOllt the advantage of 40 the heating device.

The object therefore of the invention is to provide a new and improvedheating device. Other objects of the invention will more fully appearfrom the following description and the accompanying drawings and will bepointed out in the annexed claims.

In the accompanying drawings there has been disclosed a structuredesigned to carry out the objects of the invention, but it is to beunderstood that the invention is not confined to the exact featuresshown, as various changes may be made within the scope of the claimswhich follow.

In the drawings:

Figure 1 "s a view in internal combustion engine with the novel deviceinstalled and showing, in vertical section, a portion of the floor anddash or instrunient board;

Figure 2 isa vertical section through the heating chamber;

Figure 3 is a vertical section onthe line 3-3 ofv Figure-'2 with theaddition, in vertical section, of the walls of the adjacent water-jacketportion of the cooling system;

Figure 4 is a view in front elevation of the switch mechanism as mountedupon a portion of .an instrument board;

Figure 5 is a vertical section on the line 5-5 of Figure 4;

Eigure 6- 'is a cross-section on the line 6-6 of Figure 4;

Figure 7 is a wiring diagram of the heating unit and sections; and

Figure 8 is a partial view of the opposite sides ofthe plug support toshow the indicating means.

. In this embodiment of the invention there is provided a water chamber8, formed by the casing -9, preferably of metal. This waterchamber-casing, due to the novel features and mounting thereof, may beformed of a single integral casting. This castin is shown as securedtothe wall of the coo ing 85 system of an internal combustion engine andthe casing is provided with one or more openings adapted to communicatewith the interior of, the cooling system so that there may becirculation of the water to and from the heating chamber.

The novel form of securing this heating chamber to the walls of thecooling system not only assures a secure mounting but also provides themeans for the" passage of the circulatory water to and from the heatingchamber. As here shown, the casin 9 is provided with transverselyenlarge portions 11. and 12. These are preferably disposed adjacentopposite ends of the casing and upon opposite sides of its median axis.Each enlarged portion has an opening in each of its opposite faces andthese openings are alined for the reception of the securing means. Suchsecuring means referably consists of a headed bolt 13 which is adaptedto be passed through the alined openings in the casing and to extendside elevation of an through, and be received in threaded engagementwithin, the wall 14 of the cooling system. These bolts 13 effect a snugfit with the alined apertures in the casing and a packing washer 15 ispreferably mserted between the bolt-head 16 and the ad acent outer faceof the casing.

Communication is afforded between the cooling system and the heatingchamber by means of these bolts. To that end each bolt is hollowed atits inner end and this recess 17 extends throughout its major portionbut terminates short of the head of the bolt, as shown in Figure 3. Eachbolt hasseveral openings 18 cut throu h it substantially at right an lesto the b0 t, to afford free circulation tween the bolt recess and theinterior of the heating chamber. These hollow bolts are two in numberand secure the casing adjacent its opposite ends to the wall of thecooling system.

A heating unit of the electrical type is preferably employed within thisheating chamber. One end of the heating chamber is formed with anintegral neck 19, the outer face of which is threaded for reception ofthe similarl threaded cap 21. The annular head 22 of the heating unitsnugly fits within the cap 21 and against the inwardly presentedshoulder of the cap which holds the head against. outward movement whenthe cap 21 is screwed down. The cap 21 is apertured to permit passage ofthe sheath 23 of insulating material which carries the three wires ofthe heating unit.

The preferred form of heating unit consists of a base of insulatingmaterial in tubular form and preferably of asbestos. The heating wire 25is coiled about this asbestos base and a second insulating covering islaid over the heating wires. The coverin preferably consists of layers26 of mica.

metallic cylindrical shell 27, preferably of.

relatively thin brass, encloses the whole unit. This shell is closed atits inner end and its outer end effects a snug fit with the annularreduced portion 28 of the head 22. The outside diameter of the shell 27is such that it makes a water-tight connection with the inner face ofthe neck 19 of the casin 9. Thus the water in the chamber 8 may beheated by the unit but can neither come into contact with the heatingwire nor pass from the easing other than through the two circulatorypassages provided bythe hollowed bolts.

This heating unit is adapted to provide a plurality of heats, such forexample, as a high and a low heat. Thisprovision is simply eifected byemploying a terminal connected to each end of the heating wire and witha third terminal connected to an intermediate rtion thereof. As is shownin the wiring iagram, Figure 7, these terminals ma be of any convenientform and they are eac shown as of a common type such as the contactshere shown are of the opposed finger type and the contacts 34 and 35 areof equal length and are greater than the relatively shorter contact 36.

The three plugs are mounted upon a laminated panel 37 formed ofinsulating material and providing an annular groove within which toreceive the peripheral ofi'set flange 38 of the recessed plate 39adapted to be screwed to the instrument-board 41. The two similar plugsare connected by the wires 42 and 43 to the ends of -the heating wirewhile the short plug 33 is connected by wire 44 to an intermediateportion of the heating wire. The finger contacts are preferably carriedwithin the metallic insulated compartinents provided by the head 45. Thethree contacts, as well as the plugs, are preferably arranged in astraight line, and the shortfingered contact 36 is joined by theconnector 46 to th middle long-fingered contact 35. A main line wire 47connects the contact 34 with a uitable source of electric energy (notshown), while the other main line wire 48 leads to the contacts 35 and36. The outer portion of the head, 45 is recessed and is closed by a cap49 suitably secured to the head and apertured to ermit passage of themain l1ne wires 47 an 48. i

In the operative use of this device, the

high and low heats are obtained by a simple reversal of the connections.As the three plugs are shown as in relatively fixed sition, the changeis made by reversal o the finger sockets or contacts. For example, when,the contacts are held in the position shown adjacent. the plugs inFigure 7, they maybe manually moved into en agement with the lugs. Suchposition wi 1 be that shown in igure 6. The outer long contact ispreferably used as the positive side of the supply line and the otherlong contact and its connected short contact are on the negative side.As will be noted in the drawings, the short contact does not effectelectrical connection with the short plug, hence the wire 44 to theintermediate portion of the heating wire 25 is dead.

The current therefore passes through the whole heating coil or wire 25through the end wires 42 and 43. However, when the socket is reversed,'as shown in the lower part of Figure 7, all three plugs and contactsefi'ect electrical connection because the short fingers of the contact36 receive the I Ill 25 from whence it takes the two aths to,

the terminal wires 42 and 43 to t e %lugs 31 and 32 and the contacts 34and 35. ach of the two paths is about one-half of the whole wire 25 andhence -a much higher heat will be developed by the increased passa ofcurrent.

fis shown in Figure 8, indicating mean are preferably provided toindicate the operative position of the socket. For example, the letter His placed u on one side of the socket and the letter u on the other.Furthermore, the letter H is referably iiitter L is sunk so that theymay be used as tactile indicatin means, 1. e., will give the desirediDdlCEtIODS, by touch as we as y sight By the use of this novel andimproved device, the water is provided with an entrance and an exit toand from the hea chamber, a. plurality of heats are provide the controlof the heating device is in a convenient lace upon the usualinstrumentboard, t e hollow bolts have the double function of securingthe casing in place and of providing a circulating passage for thewater, the instrumentboard need not be cutto run the wires throu h asthe use of the plate obviates such dISIldVfl-lltlfi, and it may also beadditionally noted t t the use of the compartment type) of socketprevents the fin rs or clips in spreading outwardly reyond propercircuit-closing limits or toward short-circuiting engagements.

walloftecoo' Having thus described our invention what we claim as newand desire to secure by Letters Patent, is:

1. In a heating device for the water cooling system of an internalcombustion engine, the combination of a casing providin a water chamberand havin a pair 0 alined a rtures therethroug securin means a ap'ted tobe passed throu h sai pair of a rtures and to be secure to the bugsystem, said securing means having an inner hollowed portion afiordingcommunication between the water chamber and the systemiforinter-circula-I tion of the water, and heating means in the chamber.- 7

2.-In a heating device for the water cooling system of an internalcombustion engine, the combination of a casing providing a waterchamber, means for securing the f casing to a wall of said cooli system,heating means in the chamber, t e cam and the wall having a plurality ofspa intercommunicating openings whereby 1 the embossed or raised whilethe water may freely circulate to and from the water chamber.

8. In a heating device for the water cooling system of an internalcombustion engine, the combination of a casing providing a water chamberand having splaced pairs of alined apertures therethroug securin meansadapted to be passed throu h eac pair of apertures and to be securedwall of the cooling system, each of said securing means having an innerhollowed portion afiording communication between the water chamber andthe system for intercirculation of the water, and heating means in thechamber.

tothe- 4. In a heating device for'thetwater cool- 1 ing system of aninternal combustion engine,

the combinationof a casing providing a ing ada ted to affordcommunication be v tween t e water chamber and the system forinter-circulation of the water.

5. In a heating device for the water cooling system of an internalcombustion engine, the combination of a casing providin a water chamber,heating means therein an spaced from the inner face thereof, the easinghaving an enlarged portion with a air of alined openings in the oppositesides thereof, securing means adapted to be secured in said alinedopenin tend through the casing an the wall of the cooling system tosecure the casin to said wall, the securing means having a ollow portionto afiord communication between the cooling system and the water chamberfor inter-circulation of the water.

6. In a heating device for the water cool-- ing system of an internalcombustion engine, the combination of a casing providing a waterchamber, heating means thereinand spaced from the inner face thereof,the casing havin enlarged portions upon-oposite sides 0 said heatingmeans, each enarged portion having a pair of alined openings in theopposite sides thereof, securing means adapted to be insertedthrougheach alined pair of openin s and to extend through the casing anthe wall of the cooling s stem to secure the casing to said wall eacsecuring means having a hollow portion to afford communicationbetweenthe cooli system and the water chamber or inter-circulation ofthe water.

7 In a heating device for the water cool- 7 ing system of an internalcombustion engine,

the combination of a casing providing 'a water chamber adapted to besecured'to a and to ex- Wall of the cooling system to permitintercirculation of the water beween the system and the chamber, anelectric heating element 'in said casing, said heating element cem- 6prisin an insulated base, electric wires asse thereabout, anon-conducting covermg for said wires, and a metallic shell

